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Standard Form of a Quadratic Equation

Simplify and ...

Question

Simplify and check if the following equation is a Quadratic equation.
$x^{3} - 5 x^{2} + 8 = (x + 2)^{3}$

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Solution

$x^{3} - 5 x^{2} + 8 = {(x + 2)}^{3} x^{3} - 5 x^{2} + 8 = x^{3} + 6 x^{2} + 12 x + 8 11 x^{2} + 12 x = 0$

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